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[PATCH] expose sysfs functions for sharing it
This patch exposes the wait_for_sysfs functions to all possible users, so we need to maintain only one list of exceptions. The last list is hereby removed from udev.c.
This commit is contained in:
kay.sievers@vrfy.org
Greg KH
parent
796ed8851b
commit
f071348004
4
Makefile
4
Makefile
@ -212,6 +212,7 @@ OBJS = udev_lib.o \
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udev_config.o \
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udev_add.o \
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udev_remove.o \
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udev_sysfs.o \
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udevdb.o \
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namedev.o \
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namedev_parse.o \
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@ -224,6 +225,7 @@ HEADERS = udev.h \
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namedev.h \
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udev_version.h \
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udevdb.h \
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udev_sysfs.h \
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klibc_fixups.h \
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logging.h \
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selinux.h \
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@ -303,7 +305,7 @@ $(SENDER): $(LIBC) $(SENDER).o $(OBJS) udevd.h
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$(QUIET) $(STRIPCMD) $@
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$(WAIT): $(WAIT).o $(OBJS) $(HEADERS) $(LIBC)
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$(QUIET) $(LD) $(LDFLAGS) -o $@ $(CRT0) $(WAIT).o $(SYSFS) $(LIB_OBJS) $(ARCH_LIB_OBJS)
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$(QUIET) $(LD) $(LDFLAGS) -o $@ $(CRT0) $(WAIT).o udev_sysfs.o udev_lib.o udev_config.o $(SYSFS) $(LIB_OBJS) $(ARCH_LIB_OBJS)
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$(QUIET) $(STRIPCMD) $@
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#.c.o:
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43
udev.c
43
udev.c
@ -33,6 +33,7 @@
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#include "libsysfs/sysfs/libsysfs.h"
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#include "udev.h"
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#include "udev_lib.h"
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#include "udev_sysfs.h"
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#include "udev_version.h"
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#include "logging.h"
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#include "namedev.h"
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@ -76,35 +77,6 @@ static void asmlinkage sig_handler(int signum)
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}
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}
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/* list of subsystems we don't care about. not listing such systems here
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* is not critical, but it makes it faster as we don't look for the "dev" file
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*/
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static int subsystem_without_dev(const char *subsystem)
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{
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char *subsystem_blacklist[] = {
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"scsi_host",
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"scsi_device",
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"usb_host",
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"pci_bus",
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"pcmcia_socket",
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"bluetooth",
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"i2c-adapter",
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"pci_bus",
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"ieee1394",
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"ieee1394_host",
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"ieee1394_node",
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NULL
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};
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char **subsys;
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for (subsys = subsystem_blacklist; *subsys != NULL; subsys++) {
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if (strcmp(subsystem, *subsys) == 0)
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return 1;
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}
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return 0;
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}
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int main(int argc, char *argv[], char *envp[])
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{
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struct sigaction act;
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@ -151,7 +123,7 @@ int main(int argc, char *argv[], char *envp[])
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dbg("no devpath?");
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goto exit;
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}
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dbg("looking at '%s'", udev.devpath);
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dbg("looking at '%s'", devpath);
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/* we only care about class devices and block stuff */
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if (!strstr(devpath, "class") && !strstr(devpath, "block")) {
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@ -164,13 +136,14 @@ int main(int argc, char *argv[], char *envp[])
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goto exit;
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}
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udev_set_values(&udev, devpath, subsystem);
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/* skip blacklisted subsystems */
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if (subsystem_without_dev(subsystem)) {
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if (udev.type != 'n' && subsystem_expect_no_dev(subsystem)) {
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dbg("don't care about '%s' devices", subsystem);
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goto exit;
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};
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udev_set_values(&udev, devpath, subsystem);
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}
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/* set signal handlers */
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@ -197,9 +170,6 @@ int main(int argc, char *argv[], char *envp[])
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case ADD:
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dbg("udev add");
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/* init rules */
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namedev_init();
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/* open the device */
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snprintf(path, SYSFS_PATH_MAX, "%s%s", sysfs_path, udev.devpath);
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class_dev = sysfs_open_class_device_path(path);
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@ -209,6 +179,9 @@ int main(int argc, char *argv[], char *envp[])
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}
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dbg("opened class_dev->name='%s'", class_dev->name);
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/* init rules */
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namedev_init();
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/* name, create node, store in db */
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retval = udev_add_device(&udev, class_dev);
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387
udev_sysfs.c
Normal file
387
udev_sysfs.c
Normal file
@ -0,0 +1,387 @@
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/*
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* udev_sysfs.c - sysfs linux kernel specific knowledge
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*
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* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
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* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
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*
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* This program is free software; you can redistribute it and/or modify it
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* under the terms of the GNU General Public License as published by the
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* Free Software Foundation version 2 of the License.
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*
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* This program is distributed in the hope that it will be useful, but
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* WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License along
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* with this program; if not, write to the Free Software Foundation, Inc.,
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* 675 Mass Ave, Cambridge, MA 02139, USA.
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*
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*/
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#include <stdio.h>
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#include <stddef.h>
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#include <stdlib.h>
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#include <unistd.h>
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#include <string.h>
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#include <ctype.h>
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#include <errno.h>
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#include <sys/stat.h>
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#include "logging.h"
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#include "udev_version.h"
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#include "udev_sysfs.h"
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#include "libsysfs/sysfs/libsysfs.h"
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/* list of subsystem specific files
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* NULL if there is no file to wait for
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*/
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static struct subsystem_file {
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char *subsystem;
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char *file;
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} subsystem_files[] = {
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{ .subsystem = "net", .file = "ifindex" },
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{ .subsystem = "scsi_host", .file = "unique_id" },
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{ .subsystem = "scsi_device", .file = NULL },
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{ .subsystem = "pcmcia_socket", .file = "card_type" },
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{ .subsystem = "usb_host", .file = NULL },
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{ .subsystem = "bluetooth", .file = "address" },
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{ .subsystem = "firmware", .file = "data" },
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{ .subsystem = "i2c-adapter", .file = NULL },
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{ .subsystem = "pci_bus", .file = NULL },
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{ .subsystem = "ieee1394", .file = NULL },
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{ .subsystem = "ieee1394_host", .file = NULL },
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{ .subsystem = "ieee1394_node", .file = NULL },
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{ NULL, NULL }
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};
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int subsystem_expect_no_dev(const char *subsystem)
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{
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struct subsystem_file *file;
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for (file = subsystem_files; file->subsystem != NULL; file++)
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if (strcmp(subsystem, file->subsystem) == 0)
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return 1;
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return 0;
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}
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/* get subsystem specific files, returns "dev" if no other found */
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static char *get_subsystem_specific_file(const char *subsystem)
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{
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struct subsystem_file *file;
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/* look if we want to look for another file instead of "dev" */
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for (file = subsystem_files; file->subsystem != NULL; file++)
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if (strcmp(subsystem, file->subsystem) == 0)
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return file->file;
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return "dev";
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}
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/* wait for class pecific file to show up */
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static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev,
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const char **error)
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{
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const char *file;
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char filename[SYSFS_PATH_MAX];
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int loop;
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file = get_subsystem_specific_file(class_dev->classname);
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if (file == NULL) {
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dbg("class '%s' has no file to wait for", class_dev->classname);
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return 0;
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}
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strcpy(filename, class_dev->path);
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strcat(filename, "/");
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strcat(filename, file);
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dbg("looking at class '%s' for specific file '%s' with full name %s", class_dev->classname, file, filename);
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loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
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while (--loop) {
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struct stat stats;
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if (stat(class_dev->path, &stats) == -1) {
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dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path);
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return -ENODEV;
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}
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if (stat(filename, &stats) == 0) {
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dbg("class '%s' specific file '%s' found", class_dev->classname, file);
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return 0;
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}
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usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
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}
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dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
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if (error)
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*error = "class specific file unavailable";
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return -ENOENT;
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}
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/* check if we need to wait for a physical device */
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static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
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{
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/* list of devices without a "device" symlink to the physical device
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* if device is set to NULL, no devices in that subsystem has a link */
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static struct class_device {
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char *subsystem;
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char *device;
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} class_device[] = {
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{ .subsystem = "block", .device = "double" },
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{ .subsystem = "block", .device = "nb" },
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{ .subsystem = "block", .device = "ram" },
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{ .subsystem = "block", .device = "loop" },
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{ .subsystem = "block", .device = "fd" },
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{ .subsystem = "block", .device = "md" },
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{ .subsystem = "block", .device = "dos_cd" },
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{ .subsystem = "block", .device = "rflash" },
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{ .subsystem = "block", .device = "rom" },
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{ .subsystem = "block", .device = "rrom" },
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{ .subsystem = "block", .device = "flash" },
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{ .subsystem = "block", .device = "msd" },
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{ .subsystem = "block", .device = "sbpcd" },
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{ .subsystem = "block", .device = "pcd" },
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{ .subsystem = "block", .device = "pf" },
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{ .subsystem = "block", .device = "scd" },
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{ .subsystem = "block", .device = "ubd" },
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{ .subsystem = "block", .device = "dm-" },
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{ .subsystem = "input", .device = "event" },
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{ .subsystem = "input", .device = "mice" },
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{ .subsystem = "input", .device = "mouse" },
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{ .subsystem = "input", .device = "ts" },
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{ .subsystem = "vc", .device = NULL },
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{ .subsystem = "tty", .device = NULL },
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{ .subsystem = "cpuid", .device = "cpu" },
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{ .subsystem = "graphics", .device = "fb" },
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{ .subsystem = "mem", .device = NULL },
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{ .subsystem = "misc", .device = NULL },
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{ .subsystem = "msr", .device = NULL },
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{ .subsystem = "netlink", .device = NULL },
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{ .subsystem = "net", .device = "sit" },
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{ .subsystem = "net", .device = "lo" },
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{ .subsystem = "net", .device = "tap" },
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{ .subsystem = "net", .device = "ipsec" },
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{ .subsystem = "net", .device = "dummy" },
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{ .subsystem = "net", .device = "irda" },
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{ .subsystem = "net", .device = "ppp" },
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{ .subsystem = "ppp", .device = NULL },
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{ .subsystem = "sound", .device = NULL },
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{ .subsystem = "printer", .device = "lp" },
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{ .subsystem = "nvidia", .device = NULL },
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{ .subsystem = "video4linux", .device = "vbi" },
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{ .subsystem = "lirc", .device = NULL },
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{ .subsystem = "firmware", .device = NULL },
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{ .subsystem = "drm", .device = NULL },
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{ .subsystem = "pci_bus", .device = NULL },
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{ .subsystem = "ieee1394", .device = NULL },
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{ .subsystem = "ieee1394_host", .device = NULL },
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{ .subsystem = "ieee1394_node", .device = NULL },
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{ .subsystem = "raw", .device = NULL },
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{ NULL, NULL }
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};
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struct class_device *classdevice;
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int len;
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for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) {
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if (strcmp(class_dev->classname, classdevice->subsystem) == 0) {
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/* see if no device in this class is expected to have a device-link */
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if (classdevice->device == NULL)
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return 1;
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len = strlen(classdevice->device);
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/* see if device name matches */
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if (strncmp(class_dev->name, classdevice->device, len) != 0)
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continue;
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/* exact name match */
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if (strlen(class_dev->name) == len)
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return 1;
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/* name match with instance number */
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if (isdigit(class_dev->name[len]))
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return 1;
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}
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}
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return 0;
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}
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/* skip waiting for the bus */
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static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
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{
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static char *devices_without_bus[] = {
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"scsi_host",
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"i2c-adapter",
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NULL
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};
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char **device;
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for (device = devices_without_bus; *device != NULL; device++) {
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int len = strlen(*device);
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if (strncmp(class_dev->classname, *device, len) == 0)
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return 1;
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}
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return 0;
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}
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/* wait for the bus and for a bus specific file to show up */
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int wait_for_bus_device(struct sysfs_device *devices_dev,
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const char **error)
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{
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static struct bus_file {
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char *bus;
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char *file;
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} bus_files[] = {
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{ .bus = "scsi", .file = "vendor" },
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{ .bus = "usb", .file = "idVendor" },
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{ .bus = "usb", .file = "iInterface" },
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{ .bus = "usb", .file = "bNumEndpoints" },
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{ .bus = "usb-serial", .file = "detach_state" },
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{ .bus = "ide", .file = "detach_state" },
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{ .bus = "pci", .file = "vendor" },
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{ .bus = "platform", .file = "detach_state" },
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{ .bus = "i2c", .file = "detach_state" },
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{ NULL }
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};
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struct bus_file *busfile;
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int loop;
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/* wait for the bus device link to the devices device */
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loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
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while (--loop) {
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if (sysfs_get_device_bus(devices_dev) == 0)
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break;
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usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
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}
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if (loop == 0) {
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dbg("error: getting bus device link");
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if (error)
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*error = "no bus device link";
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return -1;
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}
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dbg("bus device link found for bus '%s'", devices_dev->bus);
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/* wait for a bus specific file to show up */
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loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
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while (--loop) {
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int found = 0;
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for (busfile = bus_files; busfile->bus != NULL; busfile++) {
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if (strcmp(devices_dev->bus, busfile->bus) == 0) {
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found = 1;
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dbg("looking at bus '%s' for specific file '%s'", devices_dev->bus, busfile->file);
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if (sysfs_get_device_attr(devices_dev, busfile->file) != NULL) {
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dbg("bus '%s' specific file '%s' found", devices_dev->bus, busfile->file);
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return 0;
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}
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}
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}
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if (found == 0) {
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if (error)
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*error = "unknown bus";
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info("error: unknown bus, please report to "
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"<linux-hotplug-devel@lists.sourceforge.net> '%s'", devices_dev->bus);
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return -1;
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}
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usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
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}
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dbg("error: getting bus '%s' specific file '%s'", devices_dev->bus, busfile->file);
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if (error)
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*error = "bus specific file unavailable";
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return -1;
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}
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struct sysfs_class_device *open_class_device_wait(const char *path)
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{
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struct sysfs_class_device *class_dev;
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int loop;
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loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
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while (--loop) {
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class_dev = sysfs_open_class_device_path(path);
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if (class_dev)
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break;
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usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
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}
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return (class_dev);
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}
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int wait_for_class_device(struct sysfs_class_device *class_dev,
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const char **error)
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{
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struct sysfs_class_device *class_dev_parent;
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struct sysfs_device *devices_dev = NULL;
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int loop;
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if (wait_for_class_device_attributes(class_dev, error) != 0)
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return -ENOENT;
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|
||||
/* skip devices without devices-link */
|
||||
if (class_device_expect_no_device_link(class_dev)) {
|
||||
dbg("no device symlink expected for '%s', ", class_dev->name);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* the symlink may be on the parent device */
|
||||
class_dev_parent = sysfs_get_classdev_parent(class_dev);
|
||||
if (class_dev_parent)
|
||||
dbg("looking at parent device for device link '%s'", class_dev_parent->path);
|
||||
|
||||
/* wait for the symlink to the devices device */
|
||||
dbg("waiting for symlink to devices device");
|
||||
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
|
||||
while (--loop) {
|
||||
if (class_dev_parent)
|
||||
devices_dev = sysfs_get_classdev_device(class_dev_parent);
|
||||
else
|
||||
devices_dev = sysfs_get_classdev_device(class_dev);
|
||||
|
||||
if (devices_dev)
|
||||
break;
|
||||
|
||||
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
|
||||
}
|
||||
if (!devices_dev) {
|
||||
dbg(" error: no devices device symlink found");
|
||||
if (error)
|
||||
*error = "no device symlink";
|
||||
return -ENODEV;
|
||||
}
|
||||
dbg("device symlink found pointing to '%s'", devices_dev->path);
|
||||
|
||||
/* wait for the bus value */
|
||||
if (class_device_expect_no_bus(class_dev)) {
|
||||
dbg("no bus device expected for '%s', ", class_dev->classname);
|
||||
return 0;
|
||||
} else {
|
||||
return wait_for_bus_device(devices_dev, error);
|
||||
}
|
||||
}
|
||||
|
||||
struct sysfs_device *open_devices_device_wait(const char *path)
|
||||
{
|
||||
struct sysfs_device *devices_dev;
|
||||
int loop;
|
||||
|
||||
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
|
||||
while (--loop) {
|
||||
devices_dev = sysfs_open_device_path(path);
|
||||
if (devices_dev)
|
||||
break;
|
||||
|
||||
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
|
||||
}
|
||||
|
||||
return(devices_dev);
|
||||
}
|
||||
36
udev_sysfs.h
Normal file
36
udev_sysfs.h
Normal file
@ -0,0 +1,36 @@
|
||||
/*
|
||||
* udev_sysfs.h
|
||||
*
|
||||
* Copyright (C) 2004 Kay Sievers <kay.sievers@vrfy.org>
|
||||
* Copyright (C) 2004 Greg Kroah-Hartman <greg@kroah.com>
|
||||
*
|
||||
* This program is free software; you can redistribute it and/or modify it
|
||||
* under the terms of the GNU General Public License as published by the
|
||||
* Free Software Foundation version 2 of the License.
|
||||
*
|
||||
* This program is distributed in the hope that it will be useful, but
|
||||
* WITHOUT ANY WARRANTY; without even the implied warranty of
|
||||
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
|
||||
* General Public License for more details.
|
||||
*
|
||||
* You should have received a copy of the GNU General Public License along
|
||||
* with this program; if not, write to the Free Software Foundation, Inc.,
|
||||
* 675 Mass Ave, Cambridge, MA 02139, USA.
|
||||
*
|
||||
*/
|
||||
|
||||
#ifndef _UDEV_SYSFS_H_
|
||||
#define _UDEV_SYSFS_H_
|
||||
|
||||
#include "libsysfs/sysfs/libsysfs.h"
|
||||
|
||||
#define WAIT_MAX_SECONDS 5
|
||||
#define WAIT_LOOP_PER_SECOND 20
|
||||
|
||||
extern int subsystem_expect_no_dev(const char *subsystem);
|
||||
extern int wait_for_bus_device(struct sysfs_device *devices_dev, const char **error);
|
||||
extern int wait_for_class_device(struct sysfs_class_device *class_dev, const char **error);
|
||||
extern struct sysfs_class_device *open_class_device_wait(const char *path);
|
||||
extern struct sysfs_device *open_devices_device_wait(const char *path);
|
||||
|
||||
#endif /* _UDEV_SYSFS_H_ */
|
||||
339
wait_for_sysfs.c
339
wait_for_sysfs.c
@ -34,12 +34,9 @@
|
||||
|
||||
#include "logging.h"
|
||||
#include "udev_version.h"
|
||||
#include "udev_sysfs.h"
|
||||
#include "libsysfs/sysfs/libsysfs.h"
|
||||
|
||||
#ifndef FILENAME_MAX
|
||||
#define FILENAME_MAX 4096
|
||||
#endif
|
||||
|
||||
#ifdef LOG
|
||||
unsigned char logname[LOGNAME_SIZE];
|
||||
void log_message(int level, const char *format, ...)
|
||||
@ -52,336 +49,6 @@ void log_message(int level, const char *format, ...)
|
||||
}
|
||||
#endif
|
||||
|
||||
#define WAIT_MAX_SECONDS 5
|
||||
#define WAIT_LOOP_PER_SECOND 20
|
||||
|
||||
/* wait for specific file to show up, normally the "dev"-file */
|
||||
static int wait_for_class_device_attributes(struct sysfs_class_device *class_dev,
|
||||
const char **error)
|
||||
{
|
||||
static struct class_file {
|
||||
char *subsystem;
|
||||
char *file;
|
||||
} class_files[] = {
|
||||
{ .subsystem = "net", .file = "ifindex" },
|
||||
{ .subsystem = "scsi_host", .file = "unique_id" },
|
||||
{ .subsystem = "scsi_device", .file = NULL },
|
||||
{ .subsystem = "pcmcia_socket", .file = "card_type" },
|
||||
{ .subsystem = "usb_host", .file = NULL },
|
||||
{ .subsystem = "bluetooth", .file = "address" },
|
||||
{ .subsystem = "firmware", .file = "data" },
|
||||
{ .subsystem = "i2c-adapter", .file = NULL },
|
||||
{ .subsystem = "pci_bus", .file = NULL },
|
||||
{ .subsystem = "ieee1394", .file = NULL },
|
||||
{ .subsystem = "ieee1394_host", .file = NULL },
|
||||
{ .subsystem = "ieee1394_node", .file = NULL },
|
||||
{ NULL, NULL }
|
||||
};
|
||||
struct class_file *classfile;
|
||||
char *file = "dev";
|
||||
char filename[FILENAME_MAX];
|
||||
int loop;
|
||||
|
||||
/* look if we want to look for another file instead of "dev" */
|
||||
for (classfile = class_files; classfile->subsystem != NULL; classfile++) {
|
||||
if (strcmp(class_dev->classname, classfile->subsystem) == 0) {
|
||||
if (classfile->file == NULL) {
|
||||
dbg("class '%s' has no file to wait for", class_dev->classname);
|
||||
return 0;
|
||||
}
|
||||
file = classfile->file;
|
||||
break;
|
||||
}
|
||||
}
|
||||
|
||||
strcpy(filename, class_dev->path);
|
||||
strcat(filename, "/");
|
||||
strcat(filename, file);
|
||||
dbg("looking at class '%s' for specific file '%s' with full name %s", class_dev->classname, class_dev->path, filename);
|
||||
|
||||
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
|
||||
while (--loop) {
|
||||
struct stat stats;
|
||||
|
||||
if (stat(class_dev->path, &stats) == -1) {
|
||||
dbg("'%s' now disappeared (probably remove has beaten us)", class_dev->path);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
if (stat(filename, &stats) == 0) {
|
||||
dbg("class '%s' specific file '%s' found", class_dev->classname, file);
|
||||
return 0;
|
||||
}
|
||||
|
||||
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
|
||||
}
|
||||
|
||||
dbg("error: getting class '%s' specific file '%s'", class_dev->classname, file);
|
||||
*error = "class specific file unavailable";
|
||||
return -ENOENT;
|
||||
}
|
||||
|
||||
/* check if we need to wait for a physical device */
|
||||
static int class_device_expect_no_device_link(struct sysfs_class_device *class_dev)
|
||||
{
|
||||
/* list of devices without a "device" symlink to the physical device
|
||||
* if device is set to NULL, no devices in that subsystem has a link */
|
||||
static struct class_device {
|
||||
char *subsystem;
|
||||
char *device;
|
||||
} class_device[] = {
|
||||
{ .subsystem = "block", .device = "double" },
|
||||
{ .subsystem = "block", .device = "nb" },
|
||||
{ .subsystem = "block", .device = "ram" },
|
||||
{ .subsystem = "block", .device = "loop" },
|
||||
{ .subsystem = "block", .device = "fd" },
|
||||
{ .subsystem = "block", .device = "md" },
|
||||
{ .subsystem = "block", .device = "dos_cd" },
|
||||
{ .subsystem = "block", .device = "rflash" },
|
||||
{ .subsystem = "block", .device = "rom" },
|
||||
{ .subsystem = "block", .device = "rrom" },
|
||||
{ .subsystem = "block", .device = "flash" },
|
||||
{ .subsystem = "block", .device = "msd" },
|
||||
{ .subsystem = "block", .device = "sbpcd" },
|
||||
{ .subsystem = "block", .device = "pcd" },
|
||||
{ .subsystem = "block", .device = "pf" },
|
||||
{ .subsystem = "block", .device = "scd" },
|
||||
{ .subsystem = "block", .device = "ubd" },
|
||||
{ .subsystem = "block", .device = "dm-" },
|
||||
{ .subsystem = "input", .device = "event" },
|
||||
{ .subsystem = "input", .device = "mice" },
|
||||
{ .subsystem = "input", .device = "mouse" },
|
||||
{ .subsystem = "input", .device = "ts" },
|
||||
{ .subsystem = "vc", .device = NULL },
|
||||
{ .subsystem = "tty", .device = NULL },
|
||||
{ .subsystem = "cpuid", .device = "cpu" },
|
||||
{ .subsystem = "graphics", .device = "fb" },
|
||||
{ .subsystem = "mem", .device = NULL },
|
||||
{ .subsystem = "misc", .device = NULL },
|
||||
{ .subsystem = "msr", .device = NULL },
|
||||
{ .subsystem = "netlink", .device = NULL },
|
||||
{ .subsystem = "net", .device = "sit" },
|
||||
{ .subsystem = "net", .device = "lo" },
|
||||
{ .subsystem = "net", .device = "tap" },
|
||||
{ .subsystem = "net", .device = "ipsec" },
|
||||
{ .subsystem = "net", .device = "dummy" },
|
||||
{ .subsystem = "net", .device = "irda" },
|
||||
{ .subsystem = "net", .device = "ppp" },
|
||||
{ .subsystem = "ppp", .device = NULL },
|
||||
{ .subsystem = "sound", .device = NULL },
|
||||
{ .subsystem = "printer", .device = "lp" },
|
||||
{ .subsystem = "nvidia", .device = NULL },
|
||||
{ .subsystem = "video4linux", .device = "vbi" },
|
||||
{ .subsystem = "lirc", .device = NULL },
|
||||
{ .subsystem = "firmware", .device = NULL },
|
||||
{ .subsystem = "drm", .device = NULL },
|
||||
{ .subsystem = "pci_bus", .device = NULL },
|
||||
{ .subsystem = "ieee1394", .device = NULL },
|
||||
{ .subsystem = "ieee1394_host", .device = NULL },
|
||||
{ .subsystem = "ieee1394_node", .device = NULL },
|
||||
{ .subsystem = "raw", .device = NULL },
|
||||
{ NULL, NULL }
|
||||
};
|
||||
struct class_device *classdevice;
|
||||
int len;
|
||||
|
||||
for (classdevice = class_device; classdevice->subsystem != NULL; classdevice++) {
|
||||
if (strcmp(class_dev->classname, classdevice->subsystem) == 0) {
|
||||
/* see if no device in this class is expected to have a device-link */
|
||||
if (classdevice->device == NULL)
|
||||
return 1;
|
||||
|
||||
len = strlen(classdevice->device);
|
||||
|
||||
/* see if device name matches */
|
||||
if (strncmp(class_dev->name, classdevice->device, len) != 0)
|
||||
continue;
|
||||
|
||||
/* exact name match */
|
||||
if (strlen(class_dev->name) == len)
|
||||
return 1;
|
||||
|
||||
/* name match with instance number */
|
||||
if (isdigit(class_dev->name[len]))
|
||||
return 1;
|
||||
}
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* skip waiting for the bus */
|
||||
static int class_device_expect_no_bus(struct sysfs_class_device *class_dev)
|
||||
{
|
||||
static char *devices_without_bus[] = {
|
||||
"scsi_host",
|
||||
"i2c-adapter",
|
||||
NULL
|
||||
};
|
||||
char **device;
|
||||
|
||||
for (device = devices_without_bus; *device != NULL; device++) {
|
||||
int len = strlen(*device);
|
||||
|
||||
if (strncmp(class_dev->classname, *device, len) == 0)
|
||||
return 1;
|
||||
}
|
||||
|
||||
return 0;
|
||||
}
|
||||
|
||||
/* wait for the bus and for a bus specific file to show up */
|
||||
static int wait_for_bus_device(struct sysfs_device *devices_dev,
|
||||
const char **error)
|
||||
{
|
||||
static struct bus_file {
|
||||
char *bus;
|
||||
char *file;
|
||||
} bus_files[] = {
|
||||
{ .bus = "scsi", .file = "vendor" },
|
||||
{ .bus = "usb", .file = "idVendor" },
|
||||
{ .bus = "usb", .file = "iInterface" },
|
||||
{ .bus = "usb", .file = "bNumEndpoints" },
|
||||
{ .bus = "usb-serial", .file = "detach_state" },
|
||||
{ .bus = "ide", .file = "detach_state" },
|
||||
{ .bus = "pci", .file = "vendor" },
|
||||
{ .bus = "platform", .file = "detach_state" },
|
||||
{ .bus = "i2c", .file = "detach_state" },
|
||||
{ NULL }
|
||||
};
|
||||
struct bus_file *busfile;
|
||||
int loop;
|
||||
|
||||
/* wait for the bus device link to the devices device */
|
||||
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
|
||||
while (--loop) {
|
||||
if (sysfs_get_device_bus(devices_dev) == 0)
|
||||
break;
|
||||
|
||||
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
|
||||
}
|
||||
if (loop == 0) {
|
||||
dbg("error: getting bus device link");
|
||||
*error = "no bus device link";
|
||||
return -1;
|
||||
}
|
||||
dbg("bus device link found for bus '%s'", devices_dev->bus);
|
||||
|
||||
/* wait for a bus specific file to show up */
|
||||
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
|
||||
while (--loop) {
|
||||
int found = 0;
|
||||
|
||||
for (busfile = bus_files; busfile->bus != NULL; busfile++) {
|
||||
if (strcmp(devices_dev->bus, busfile->bus) == 0) {
|
||||
found = 1;
|
||||
dbg("looking at bus '%s' for specific file '%s'", devices_dev->bus, busfile->file);
|
||||
if (sysfs_get_device_attr(devices_dev, busfile->file) != NULL) {
|
||||
dbg("bus '%s' specific file '%s' found", devices_dev->bus, busfile->file);
|
||||
return 0;
|
||||
}
|
||||
}
|
||||
}
|
||||
if (found == 0) {
|
||||
*error = "unknown bus";
|
||||
info("error: unknown bus, please report to "
|
||||
"<linux-hotplug-devel@lists.sourceforge.net> '%s'", devices_dev->bus);
|
||||
return -1;
|
||||
}
|
||||
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
|
||||
}
|
||||
|
||||
dbg("error: getting bus '%s' specific file '%s'", devices_dev->bus, busfile->file);
|
||||
*error = "bus specific file unavailable";
|
||||
return -1;
|
||||
}
|
||||
|
||||
|
||||
static struct sysfs_class_device *open_class_device(const char *path)
|
||||
{
|
||||
struct sysfs_class_device *class_dev;
|
||||
int loop;
|
||||
|
||||
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
|
||||
while (--loop) {
|
||||
class_dev = sysfs_open_class_device_path(path);
|
||||
if (class_dev)
|
||||
break;
|
||||
|
||||
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
|
||||
}
|
||||
|
||||
return (class_dev);
|
||||
}
|
||||
|
||||
static int wait_for_class_device(struct sysfs_class_device *class_dev,
|
||||
const char **error)
|
||||
{
|
||||
struct sysfs_class_device *class_dev_parent;
|
||||
struct sysfs_device *devices_dev = NULL;
|
||||
int loop;
|
||||
|
||||
if (wait_for_class_device_attributes(class_dev, error) != 0)
|
||||
return -ENOENT;
|
||||
|
||||
/* skip devices without devices-link */
|
||||
if (class_device_expect_no_device_link(class_dev)) {
|
||||
dbg("no device symlink expected for '%s', ", class_dev->name);
|
||||
return -ENODEV;
|
||||
}
|
||||
|
||||
/* the symlink may be on the parent device */
|
||||
class_dev_parent = sysfs_get_classdev_parent(class_dev);
|
||||
if (class_dev_parent)
|
||||
dbg("looking at parent device for device link '%s'", class_dev_parent->path);
|
||||
|
||||
/* wait for the symlink to the devices device */
|
||||
dbg("waiting for symlink to devices device");
|
||||
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
|
||||
while (--loop) {
|
||||
if (class_dev_parent)
|
||||
devices_dev = sysfs_get_classdev_device(class_dev_parent);
|
||||
else
|
||||
devices_dev = sysfs_get_classdev_device(class_dev);
|
||||
|
||||
if (devices_dev)
|
||||
break;
|
||||
|
||||
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
|
||||
}
|
||||
if (!devices_dev) {
|
||||
dbg(" error: no devices device symlink found");
|
||||
*error = "no device symlink";
|
||||
return -ENODEV;
|
||||
}
|
||||
dbg("device symlink found pointing to '%s'", devices_dev->path);
|
||||
|
||||
/* wait for the bus value */
|
||||
if (class_device_expect_no_bus(class_dev)) {
|
||||
dbg("no bus device expected for '%s', ", class_dev->classname);
|
||||
return 0;
|
||||
} else {
|
||||
return wait_for_bus_device(devices_dev, error);
|
||||
}
|
||||
}
|
||||
|
||||
static struct sysfs_device *open_devices_device(const char *path)
|
||||
{
|
||||
struct sysfs_device *devices_dev;
|
||||
int loop;
|
||||
|
||||
loop = WAIT_MAX_SECONDS * WAIT_LOOP_PER_SECOND;
|
||||
while (--loop) {
|
||||
devices_dev = sysfs_open_device_path(path);
|
||||
if (devices_dev)
|
||||
break;
|
||||
|
||||
usleep(1000 * 1000 / WAIT_LOOP_PER_SECOND);
|
||||
}
|
||||
|
||||
return(devices_dev);
|
||||
}
|
||||
|
||||
int main(int argc, char *argv[], char *envp[])
|
||||
{
|
||||
const char *devpath = "";
|
||||
@ -433,7 +100,7 @@ int main(int argc, char *argv[], char *envp[])
|
||||
filename[SYSFS_PATH_MAX-1] = '\0';
|
||||
|
||||
/* open the class device we are called for */
|
||||
class_dev = open_class_device(filename);
|
||||
class_dev = open_class_device_wait(filename);
|
||||
if (!class_dev) {
|
||||
dbg("error: class device unavailable (probably remove has beaten us)");
|
||||
goto exit;
|
||||
@ -450,7 +117,7 @@ int main(int argc, char *argv[], char *envp[])
|
||||
filename[SYSFS_PATH_MAX-1] = '\0';
|
||||
|
||||
/* open the path we are called for */
|
||||
devices_dev = open_devices_device(filename);
|
||||
devices_dev = open_devices_device_wait(filename);
|
||||
if (!devices_dev) {
|
||||
dbg("error: devices device unavailable (probably remove has beaten us)");
|
||||
goto exit;
|
||||
|
||||
Loading…
x
Reference in New Issue
Block a user